The 3x3 with an Eimac socket is non parasitic, at least the few Ive built.
With the CBer socket thats available it gets iffy at the higher frequencies
and a suppressor cant hurt.
Carl
KM1H
----- Original Message -----
From: "Mike Saculla" <fqm@msn.com>
To: "amps@contesting" <amps@contesting.com>
Sent: Friday, July 16, 2010 12:07 AM
Subject: Re: [Amps] Size of Parasitic Chokes
>
> I see 3CX3000A7 amps with no suppressor at all. How stable have any of you
> found this tube to be? Anyone have one take off on them with no
> suppressor? Or should I include one just to be safe?
>
> Mike K6MDS
>
>
> --Forwarded Message Attachment--
> From: km1h@jeremy.mv.com
> To: sub1@rogerhalstead.com; Amps@contesting.com
> Date: Thu, 15 Jul 2010 20:53:59 -0400
> Subject: Re: [Amps] Size of Parasitic Chokes
>
> The YC-156 doesnt use a socket and hasnt shown any need for a suppressor.
>
> With a spectrum analyzer its rather easy to spot a parasitic and then
> design
> whats needed. Many of the big triodes are extremely stable. Tetrodes
> respond
> well to grid suppressors, adequate screen bypassing and with a Carborundum
> style plate suppressor.
>
> I cant say what these big tubes are like on VHF but Id be tempted to build
> a
> rather big cavity for 6M to get around the output C problem. I believe
> that
> is used on the FM and TV frequencies.
>
> Is it worth the bother?
>
> Carl
> KM1H
>
>
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